Improvement in door-latches



s. OPPENHEIMER. DOOR-LATCH.

No.178,876. Patente-a June 20,1876.

liil! UivrrED STATES l'P tfrniv'r Camion sofnoMoN OPPENHEIMER, OENEWARK, NEW-JERSEY.

AIMPROVENIENT 1N DOOR-LATOHES.

Specification forming part of Letters Patent No. 178,8"76, dated J une 20, 1876;; application liled November 15,1875. k-

To all whom `it may concern:

ot', reference being had .0 the accompanying drawings, making a part of this specification, in Whichv Figure l is a plan view of the inner side of a lock containing my improvements. Fig. 2 is a perspective view ofa tumbler and its spring separated from the bolt. Fig.-3 is a like view ofthe pivoted horn for holding said' spring. Fig. 4 is an enlarged section4 of the cam-stopper and its lever, and Fig. 5 is a perspective viewy of said stopper, the dotted lines showing the shape and position of its lever.

Letters of like name and kind refer to like parts in each of the figures.

The design of my invention is to increase the eliiciency and thoroughness of operation of a door-lock; and it consists in the novel means employed for locking the latchz in position, substantially asis hereinafter specified.

. ln the annexed drawings, A represents the forked end of a latch constructed in the usual manner, and so arranged within a lock as to span the knob-bar and move longitudinally a sufficient distance to cause the outer endof said latch to project to' the desired'distance, or to be withdrawn within the casing, all in the ordinary manner.A

Pivoted upon the casing B, in rear and at oneside of one of the forks a of the latch A, is a lever, C, which has the form shown by Figs. l,- 4, and 5, and is provided with a rectangular recess, c, that extends from its upper to its lower side, and from a. point near its pivotal bear= in g D forward nearly to its front end. .At the forward end of the recess c a half-round bearing, c', is provided within the upper side of the lever C, which bearing receives two trunnions, e and e, of a cam-block, E, that has the form shown in Figs. 4 and 5, and is contained within said recess. At the lower side of the front end thelever C is cut aw'ay so as to enable the curved arm e' of the cam-block E to 'pass outward from the recess c, the arrangement shown enabling said arm to be projected from, or withdrawn into, said lever b y the l v swinging of said block upon its trunnions. From a point below the vertical center of the block Ea stud, e, extends reward from the rear side of the block E, and upon the same is placed a spiral spring, F, which extends between said blocks and the rear end of the recess c, and causes the-former tolmaintain .the posit-ion shown by Fig. 5, except when pressed inward, as seen in Fig. 4i.v Immediately in front of the pivoted lever O a lug, G,

is secure .to or upon the casing B, and upon its face, toward Vsaid bar, is provided with two semicircular depressions, g and g, either of which latter will receive-the -end of the projecting arm e of the block E. It', now, the lever C be' moved so as to bring the cam-arm e into either depression lqthe operation of the'k spring F will cause the .cam to lock said bar into such position, except when suliicient strength isexerted to force. said arm inward until the elevation that separates said de-V pressions .has'jbeen passed, 'when saidV camy -l will aga-in move forward and operateas alock,

as before. The shape ofthe end of the lug Gg farthest from the latch A prevents the camarm e from passing outward from thev corresponding depression g, while the lever C is turnedin the opposite direction its end will pass in rear of and engage Withthe obliquelycut end of one of the forksa of said latch, and operate as a stop to prevent the latter from being moved rearward.

The tumbler H of t-lie bolt I- is of usual shape, and at its pivotal end is provided with an arm, h, which extends downward, and has near its lower end a round opening, h'. Upon the plate B, below the tumbler H, is secured a stud, K, from which extends outwarda hornv shaped arm, 7c, that passes through the opening h of said tumbler, and, longitudinally, is formed upon a line lwhich is concentric to the pivotal bearing L of .the same, by which construction the arm h` has perfect freedom of motion as said tumbler yis-raised or lowered by the operationof the. key. A spring, M, for

found in thefreedomof motion of the tumbler, the constant and direct action of the spring, and the certainty with which the lat-ter maintainsits position while the interior mechanism uof the lock is being removed or replaced..

Having 4thus fully set forth the nature and is f A i t l The mea-ns employed ffor locking. in place the latchA a a., `consisting ofthe lever G, promerits of my invention, what I claimj as new `vided with the recess c and bearing c', the cam-block E, `having the trunnions e and e,

curved arm e and Stud el",the@spring` F; and

the lug G, provided with therecessesg `and g," `samidpzuts being combined[tofoperateinjthe l U manner `arid for the purpose substantiallyfas specified.` t y `In testimony thatI"claimtleforegoing, l" have hereuntol set my(` hand `thisl16t.l1 day of H Witnesses:

H. C. HAZARD,` WILLIAM FITCH," 

